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ASSE 1001

2008 Edition, January 1, 2008

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Performance Requirements for Atmospheric Type Vacuum Breakers

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Description / Abstract:


Vacuum Breakers shall be classified in two general types:

a. Atmospheric type, as described herein.

b. Pressure type (See ASSE Standard #1020, Performance Requirements for Pressure Vacuum Breaker Assembly, and ASSE Standard #1056, Spill Resistant Vacuum Breakers).

The atmospheric type design shall consist of a check valve member and an air vent that is normally closed when the device is pressurized, and open when the inlet pressure is atmospheric.


Inlet and outlet pipe sizes shall range from 1/8 NPT to 4 NPT (3 mm to 100 mm).

Working Pressure

Devices shall be designed to operate within a working pressure of 8.0 psi (55.2 kPa) to a minimum of 125.0 psi (861.9 kPa).

Temperature Range

a. Devices limited to cold water service shall operate within a range from 33.0 °F + 2.0 °F – 0 °F to 110.0 °F +0 °F – 2.0 °F (0.6 °C + 1.1 °C – 0 °C to 43.3 °C + 0 °C – 1.1 °C).

b. Devices intended for hot or cold water service shall operate within a range from 33.0 °F + 2.0 °F – 0 °F to 180.0 °F +0 °F – 2.0 °F (0.6 °C + 1.1 °C – 0 °C to 82.2 °C + 0 °C – 1.1 °C).